It looks good for a long life for Grandma. She dislikes the term 'robust' however.
A recent study of 4603 mothers who bore twins and 54,183 who had not, showed that mothers of twins exhibit lower postmenopausal mortality, shorter average inter-birth intervals, and higher lifetime fertility than their singleton-only bearing counterparts. From the largest historical sample of twinning mothers yet published, they concluded that "bearing twins is more likely for those with a robust phenotype and is a useful index of maternal heterogeneity."
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